Alarm-bell



(No Model.) A. LANG-DON,

ALARM BELL.

N0.-519,581. Patented May 8, 1894.

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NITED STATES PATENT OFFICE.

ALBERT H. LANGDON, or ELGIN, ILLINOIS.

ALARM-BELL.

SPECIFICATION forming part of Letters Patent No. 519,581, dated May 8, 18

Application filed December 1, 19 2.

To aZZ whom it may concern:

Be it known that I, ALBERT H. LANGDON, of Elgin, in the county of Kane and State of Illinois, have invented certain new and useful Improvements in Alarm-Bells; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enable others skilled in the art to which it pertains to makeand use thesame,

reference being had to the accompanying drawlngs, and to the letters of reference marked thereon, which form a part of this specification. v

The main object of my invention is to pro-- mers, hereinafter particularly described and.

pointed out in the claims.

In the accompanying drawings like letters deslgnate the same partsin the several figures.

Figure 1 is a front elevation or plan View of my Improved bell, the gong being removed so as to disclose the mechanism and parts of the device to the right of the line 1, 1, Fig. 3; Fig. 2 is a sectional view on the line 2, 2, Fig. 1, vlewed from the left; and Fig. 3 is a similar sectional view on the line 3, 3,. Fig. 1, viewed from the right.

i For the purpose of illustration I have shown In the drawings the device specially constructed and arrangedfor a door bell, although with little or no modification, it is applicable to any other uses for which bells of this class are employed, such as table, call and alarm bells.

A represents the base by which the bell may be attached to a door or other support to which it is to be applied. It is preferably formed as shown in Fig. 3, with a marginal rim or flange, which together with the gong B, afiords a housing for inclosing and protecting the mechanism of the bell.

a and a, are plates, which are provided with Serial No. 453,750. (No model.)

bearingsfor the train of gears and other mechanism of the bell.

C C are the bell hammers attached to the ends of' wires 0 c, by which they are connected with opposite sides of the rock shaft D.

E is a crank mounted or formed on a shaft parallel with the hammer, shaft, and connected by a rod c with a crank arm 61, projecting from the hammer shaft.

F is a spur gear meshing with a trundle wheel or pinion e'on the crank shaft.

' G is a segment of a spur gear meshing with a trundle wheel or pinion f, on the shaft of gear F. The segment gear G is mounted. and supported upon a shaft g, parallel with the hammer and crank shafts'and the shaft of gear F. It is formed or provided on the opsite side of shaft g with an arm g.

H is a rock shaft supported in bearings attached to the rear or lower plate a, transversely to the shaft g. It is provided with two cran'k arms 71. and h, projecting therefrom at approximately right angles from each other. The arm h is connected by a rod h with the arm g of segment gear G.

I is a reciprocating push rod passingthrough the baseA and-rear or lower plate a, and connected with the arm h. It is ordinarily provided on the outside, when the device is used for a door bell, with a push button, but may be provided or connected with other actuating devices or connections, according to the uses to which the bell is to be put.

Two pins or projections (l' d are provided on the rear or lower plate a, to limit the vibratory movement of the arm at, and thus relieve the said arm and its actuating connections of the'shock produced by the operation of the hammers. Two pins or projections g 9 are provided on the front or upper plate a, to limit the movement of the segment gear G in either direction and prevent its being turned out of engagement with the pinion f.

J is a spring attached at or near one end to the rear or lower plate a, and engaging at the other end-with a projection g onshaft g, for the purpose of restoring the train of gears to their normal position after they have been turned in the direction indicated by arrows in Fig. 1, by an inward thrust of the push rod I.

My improved device operates as follows: the rod I being advanced or thrust inward toward the plate a, acting through the arm h and rock shaft I-I, raises the arm 72', and through its connection with the arm g, turns the gear G in the direction indicated by the arrow, Fig. 1. The gear G, acting through pinionf, turns the gear F in the opposite direction, and the gear F in turn meshing with the pinion 6' turns the crank E in the same direction as the segment gear G. The crank E through the connecting rod 6 and arm d, vibrates the hammer arm a c, causing the hammers to strike alternately against the rim of the gong B. When the push rodI is released, the spring J, acting on the shaftg of segment gear G, turns the train of gears in opposite directions, thereby automatically repeating the etfect produced by the inward thrust or advance movement of the push rod, and producinga like number of hammer strokes upon the gong. A half inch movement of the push rod I, in the bell herein shown and described, produces sixteen hammer strokes, which are automatically repeated in the restoration of the mechanism to normal position effected by the spring J, thereby producing thirty-two hammer strokes to each complete reciprocation of the push rod I.

Various changes in the minor details of construction and arrangement of parts to adapt the device to the different uses to which it is applicable, may be made, within the in-.

tended scope of my invention.

I claim- 1. In an alarm bell the combination with the gong and base plate to which it is attached, of a rock shaft provided on opposite sides with hammers arranged to strike alternately against the inner side of the gong, a crank connected with said rock shaft and arranged to vibrate said hammers, and a push rod passing through an aperture in said base ment gear connected with and arranged to rotate said crank, a rock shaft transverse to the shaft of said segment gear and provided with two arms projecting therefrom at approximately right angles to each other, one of said arms being connected with an arm of said segment gear, and a push rod connected with the other arm of said rock shaft, substantially as and for the purposes set forth.

3. In an alarm bell, the combination with the gong, of hammers connected with opposite sides of a rock shaft, a crank connected with an arm projecting from said rock shaft, a segment gear connected by a multiplying train of gears with said crank, a rock shaft transverse to the shaft of the segment gear, provided with two arms projecting therefrom at an angle to each other, one arm being connected with an arm of said segment gear, a push rod connected with the other arm, and a spring acting upon and tending to restore said segment gear to its normal position, substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

ALBERT H. LAN GDON.

Witnesses:

. ALFRED B. CHURCH,

J OHN W. FARNUM. 

